Under new zoning, lemons<br /> invade Dakota

The folks at the National Arbor Day Foundation have come up with new hardiness zones for the United States. You guessed it: we're getting warmer in much of the country. A convenient truth if you're trying to grow sub-tropical plants in Kansas City. It's easy to fantasize about growing blue mountain coffee in my own back garden, but then there are all those unpleasant consequences: dozens of cities looking like Venice, islands disappearing beneath the waves, killer hurricanes.